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Though Iizuka san official says that it is by chance that you get "clouds" on his Kasumi knives I think lot is on your craft and the wonderful JNS you have.
I see it is not only luck that you have "clouds" on all your Shigefusa Kasumi knives.

The Japanese sword polishers chisel off thin slices of these stones and attach them to a paper backing using a lacquer and resin mixture, let them dry for a week (traditional mixture) or 1-2 days (modern synthetic resin mixture) and then cut them up into little squares and dress them on another stone. They don't polish with "raw" stone. The hardest stones are used on softer blades and the softer stones on the harder blades. hadr and softer are a relative term when talking about nihnto because on a sword, unlike on a kitchen knife, the only softer low carbon steel exosed is along the spine. .You are also not going to get the full effect unless you go two steps further using a mixture of very fine magnetite powder, clove oil and one other ingredient that I can't recall as opposed to "mud" That what fully develops the hamon features. Some guys that I know rottenstone and other very fine abrasive powders (1500-2000 grit aluminum oxide, I think) to get a similar effect. There is a very good book called "The Art Of Japanese Sword Polishing" that gives a very good introdution to this particular form of tradtional japanese insanity. I bought it and it inpired me.............to try and learn how to do a more simple modern "hybrid" form of polishing that doesn't require purchasing stones that can cost thousands of dollars for the best examples and hundreds for more pedestrian sets..